/* Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.activiti.bpmn.converter.child;

import javax.xml.stream.XMLStreamReader;

import org.activiti.bpmn.converter.util.BpmnXMLUtil;
import org.activiti.bpmn.model.Activity;
import org.activiti.bpmn.model.BaseElement;
import org.activiti.bpmn.model.BpmnModel;
import org.activiti.bpmn.model.MultiInstanceLoopCharacteristics;

public class MultiInstanceParser extends BaseChildElementParser {

    public String getElementName() {
        return ELEMENT_MULTIINSTANCE;
    }

    public void parseChildElement(XMLStreamReader xtr,
                                  BaseElement parentElement,
                                  BpmnModel model) throws Exception {
        if (!(parentElement instanceof Activity)) {
            return;
        }
        MultiInstanceLoopCharacteristics multiInstanceDef = new MultiInstanceLoopCharacteristics();
        BpmnXMLUtil.addXMLLocation(multiInstanceDef,
                                   xtr);
        if (xtr.getAttributeValue(null,
                                  ATTRIBUTE_MULTIINSTANCE_SEQUENTIAL) != null) {
            multiInstanceDef.setSequential(Boolean.valueOf(xtr.getAttributeValue(null,
                                                                                 ATTRIBUTE_MULTIINSTANCE_SEQUENTIAL)));
        }
        multiInstanceDef.setInputDataItem(xtr.getAttributeValue(ACTIVITI_EXTENSIONS_NAMESPACE,
                                                                ATTRIBUTE_MULTIINSTANCE_COLLECTION));
        multiInstanceDef.setElementVariable(xtr.getAttributeValue(ACTIVITI_EXTENSIONS_NAMESPACE,
                                                                  ATTRIBUTE_MULTIINSTANCE_VARIABLE));
        multiInstanceDef.setElementIndexVariable(xtr.getAttributeValue(ACTIVITI_EXTENSIONS_NAMESPACE,
                                                                       ATTRIBUTE_MULTIINSTANCE_INDEX_VARIABLE));

        boolean readyWithMultiInstance = false;
        try {
            while (!readyWithMultiInstance && xtr.hasNext()) {
                xtr.next();
                if (xtr.isStartElement() && ELEMENT_MULTIINSTANCE_CARDINALITY.equalsIgnoreCase(xtr.getLocalName())) {
                    multiInstanceDef.setLoopCardinality(xtr.getElementText());
                } else if (xtr.isStartElement() && ELEMENT_MULTIINSTANCE_DATAINPUT.equalsIgnoreCase(xtr.getLocalName())) {
                    multiInstanceDef.setInputDataItem(xtr.getElementText());
                } else if (xtr.isStartElement() && ELEMENT_MULTIINSTANCE_DATAITEM.equalsIgnoreCase(xtr.getLocalName())) {
                    if (xtr.getAttributeValue(null,
                                              ATTRIBUTE_NAME) != null) {
                        multiInstanceDef.setElementVariable(xtr.getAttributeValue(null,
                                                                                  ATTRIBUTE_NAME));
                    }
                } else if (xtr.isStartElement() && ELEMENT_MULTIINSTANCE_CONDITION.equalsIgnoreCase(xtr.getLocalName())) {
                    multiInstanceDef.setCompletionCondition(xtr.getElementText());
                } else if (xtr.isEndElement() && getElementName().equalsIgnoreCase(xtr.getLocalName())) {
                    readyWithMultiInstance = true;
                }
            }
        } catch (Exception e) {
            LOGGER.warn("Error parsing multi instance definition",
                        e);
        }
        ((Activity) parentElement).setLoopCharacteristics(multiInstanceDef);
    }
}
